It's really fun but way too hard! The rate that bubbles spawn is so high that it doesn't make sense to aim for anything. Freezing actually makes it harder because you have limited options of what to shoot while the far side keeps getting bigger. The shield does nothing because by the time you get hit, you're getting hit with a huge arm of bubbles that knocks off the whole shield instantly.
I really enjoyed it, but it desperately needs to be balance for longevity.